Improving multilevel Green's function interpolation method with a new interpolation grid

The key factor influencing the efficiency of the full-wave multilevel Greens function interpolation method (MLGFIM) lies in employing an appropriate interpolation scheme to efficiently approximate the Greens function. A new interpolation grid pattern named boundary clustered staggered Tartan grid (BCSTG) is proposed to improve the Greens function interpolation. By adopting BCSTG, the required number of interpolation points is greatly reduced and consequently, the efficiency of the MLGFIM is enhanced significantly. The examples of an array of dielectric spheres as well as an electric dipole and ring system have been calculated by the proposed algorithm and compared with previously reported results. The comparison results validate the algorithm and show the computational efficiencies have been enhanced by 30 and 50% for these two examples, respectively. © 2013 Copyright Taylor and Francis Group, LLC.